William l



(No Model.)

W. L. BERGEN.

MACHINE FOR THREADING BOLTS.

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Patented Sept. 4, 1883.

MNHN

UNITED STATES PATENT Orrrcn.

,WILLIAM L. BERGEN, F BATAVIA,.ILLIOIS` MACHINE FOR THREAIDING BOLTS.

" l SPECIFICATION forming part of i Letters Patent No. 284,168, dated September 4, 1883.`

Application mea March 29, rasa. (No model.)

To @ZZ 'whom it. may concern:

Beit known that I, WILLIAM L. BERGEN, a citizen ofthe United States, residingat Batavia, in the county of Kane and State of Illinois, have invented a new and useful Bolt- Threading Machine, of which the following is a specification. A l

My invention `consists in sundry improves ments `in bolt-threading machines, whereby the l. IO

chaserslmay be removed and reset quickly and accurately to the former position without the expensive devices ordinarily used4 to `secure this result; also, in a self-acting gage to set the `method,and, `in general, in various improve-` work by, in order to insure uniform length in the thread, which the` machine is designed to cut; also", in a `more efficient and durable arrangement of the vise-jaws, enabling the operator to `make thechange necessary for hold-` ingdifferentsizes and forms'of work in much less time than'N is :required by the ordinary ments in mechanism` to` be described hereinafter, designed `to make a machine more easily operated, and more durable and efficient, than those now in generaluse. 1

. i 1 The machine embodying these principles'is represented in` the accompanying drawings, in which siinilardetters of reference indicate similar` parts throughout the several views. v

Figure 1 is-an endelevation withqcarriage f I and stop-bar `J.rem`oved.` Fig.2 is a vertical section through thecenter of spindle a on the line r s, Fig. l. Fig. 3 is asectionof carriage I, `vise-jaws G, and bracket F, on the line tu, Fig.2. Fig. 4 is a plan of the machine with the cap d removed.` Fig. 5 is a vertical section on" the line a: y, Fig. 4, showing the two posi- C i tions of the gage-arm N.l Fig. 6 is an enlarged l 2 front view of the revolving die-head,'1which is principally composedof the spindle-head A, the shell B, and Chaser-holders C.V Fig. 7 is asection of` same through the axis of spin- `dle a, onthe line uw, Fig. 6.

l l Fig.l 8 is a rear view of gFig. `6 with a portion of shell B cut away to` showa portion of the `interiorf mechanism. Fig..9, is an enlarged top View of a `portion of the chaser-holder C, Fig. 6show-` of which bears "against the outer end ofthe V.o1vin g the grip ,-blocks T until the correspond- The bracket F, Figsfl, and 4, fastened rigidly to the column D in such position` that its upper.A edges are parallel with the aXis of the spindle a, and form a suitable track for the carriage I to travel on. l The carriage I, Figs. 2, 3, and 4, is a plate adapted to slide freely on` the bracket F in line parallel with the axis of the spindle a, being actuated by the hand-wheel?, connected with the pinionyi'which meshes into" the rack g, fastened to the inner edge of .bracket F, Fig. 2. The carriage I carries two vise-jaws, G, Figs. 2,3, and 4, whichfmovein a line transverse to the motion ofthe carriage. They are operated by a hand-wheel, It, Figs. 3 and 4, attached to the screw U, part of which screwsinto one vise-jaw with a `right-hand thread, and part into the other with a left-hand thread of samepitch. Furthermore, the screw U, Figs. 3 and 4, is so attached to the carriage I that it is free to` revolve, but cannotxmove endwise; hence, it follows that the revolution ofthe hand-wheel It, Fig. 3, will result` in moving the vise-jawsG apart or` together to a uniform distance from` the center. `The visejaws G are provided with two cylindrical steel grip-blocks, T, Fig. 3, which fit into suitable recesses in the j aws G, andhave several grooves cut longitudinally in their surfaces, of suitable yform for holding the work which the vise is required to grip. Any of these grooves may readily be brought into position for use by rei ing grooves `are adjacent, as shown in Fig. 3, and any cylindrical objectheld between the grip-blocks T, as h, Fig. 4, will be inalignment with thespindle a, Figs.` 2 and 4.

The' stop-bar J, Figs. 4 and `5, isheldin position by passing through the hole in the ear I, Figs. l and 4, and the hole in the carriage I at i', Fig. 3. It is provided with the stop L, Fig. 4, to check the forwardtravellof the carriage I. `It is also provided with the camstopf K to 'check the backward travel of the carriage I, and also by means of the pin Z,Fig.

IOO

4, working in connection with the spiral camslot cut in the edge of cam-stop K, to give a partial revolution to the stop-bar J when the carriage is run back;v

N, Figs. 2, 4, and 5, is a gage-arm fastened to the stop-bar J in such position that when the carriage I is back as far as thel cam-stop K will allow, the end of the arm stands across the line of the axis of spindle a, Figs. 2 and 4. In this'position it serv'esas a gage against which the end of the bolt 7L, Fig. 4, may be set before grippingv said bolt in the vise Gr. As the carriage I moves forward and the pin Z leaves the cani-stop K, the stop-bar J is caused to revolve by the spiral spring g', Fig. 4, until the gagearm N occupies the position shown by the dotted lines at N, Fig. 5. The stop-bar J also operates the arm o, Fig. 4, which serves to close the die-head by means of the pin n, Figs. 4 and 8, acting on the pinion-arm Y, as will be fully described hereinafter. rlhe revolving die-head, Figs. 6, 7, and 8, is composed of the spindle-head A, the shell B, which fits the periphery of A and may be partially revolved upon it, and the chaser-holders G, which have pivots fitting accurately into holes in the spindle-head A, one of which is shown at C', Fig. 6, one of the chaser-holders being removed. The chaser-holders C are set in position to give the proper cutting angle to the edges of the chasers c, Fig. 6, and they are held uniformly in that position by their outer ends, i', bearing against the pins V, which are rigidly set in the edge of the shell B, Figs. 4 and 6. When the chaser-holders 'C are in position for working, the shell B, Fig. 7, is prevented from turning on the head A by the clutch-pins e, which project from the inside of the shell B and enter a short distance into the'head A, Figs. 7 and 8. It follows that if the head A be drawn out of the shell B, Fig. 7, until it shall clear the ends of the clutch-pins e, then the shell B may be partially revolved around the head A in the direction indicated by the arrow in Fig. 6, and by reference to the same figure it is obvious that this motion, by changing the relative position of the pins V to the chaser-holders C, will allow the chaser-holders C to revolve on their respective pivots in the same direction as the shell B, which results in moving the cutting-ends of the chasers c away from the center and out of the thread they have cut in 7L, Fig. 4.

Fig. 9 represents a device for adjusting the chasers c in the chaser-holders C. m is a hol- Vlow screw, which screws to a shoulder in the the chasers c may be made, or they may be set in sufficiently to be recut by a master-tap,

which operation may be repeated, when necessary, until the chasers are less than half of their original length. In order to save the operators time in making changes, the sides of the hollow screws m, as shown in Fig. 9, are flattened or slabbed, so that by holding the flat sides to correspond with the sides of the slot the screw m may be inserted directly into the chaser-holder C almost to its shoulder, when a quarter-turn will tighten it to place with the fiattened sides perpendicular to the sides of the slot, thus making a very simple, accurate, and efficient adjustment for the chasers c, this being a very important point in .all threading devices when separate chasers are used. y

A device similar to the foregoing, except that the hollow screws mwere not flattened, as above described, has been used in a diehead formerly patented to me, No. 244,427, (screw-cutting.)

To operate the machine, the bolt or rod to be threaded, h, Fig. 4, is placed between the vise-jaws G, so that the left-hand end touches the gage-arm N, when it is firmly gripped by the vise. rIhe stop L, Fig. 4, is then set on the stop-bar J at such a distance from the carriage I as will allow sufficient travel to, cut the length of thread required. 'Ihe carriage I, Fig. 4, is then moved to the left by means A of hand-wheel l?, until the revolving die-head engages the rod h, and continues to draw the carriage forward in the process of cutting the thread. Vhen the carriage I has reached the stop L, the drawing ofthe rod 71. pulls the spindle-head A out of the shell B, (which cannot IOO move laterally, being held back Aby the swivelclamp b, Fig. 7 until it is clear of the clutchpins e, Fig. 7, when the pressure of the rod h, Fig. 4, on the ends of the chaser c, exerted through the holders C on the pins V, Fig. 6, will be sufcient to revolve the shell B on the head A until the chasers c are clear of the thread they have cut, when the rod h, Fig. 4, may be directly withdrawn by moving the carriage I to the right to its former position. Ihe 'pro- IIO cess by which the die-head is closed ready for another operation may be. understood. by referring to Fig. 8, in which Z represents a toothed segment fastened to the back of the spindle-head A.

. Y is a pinion meshing into the segment Z. It is provided with a shaft extending through the back of the shell B, which forms a suitable journal. Said shaft terminates in a crank or arm, which lies closely against the back ofthe shell B, Fig. 7. From the foregoing description and reference to Fig. Sit will be seen that any revolution of the pinion Y on its axis will cause, by means of the segment Z, a partial revolution of the head A in the shell B, and, conversely, if the head A be turned with reference to the shell B, the pinion Y will be revolved 011 its axis 5 but if the head A and theshell B be rotated together, the relative posi-4 in position by the clutch-pins e.

tion of the pinion Y will not be changed thereby. The case last described is operative when the machine is at work and the shell B is held In this position of the die-head the pinion-arm Y, Fig. 8, is so adjusted that its outer or `free end passes at every revolution of the die-head just inside ofthe closing-pin n, (which is operated by a" device independent of the die-head, as will be described later,). as may be seen by f reference to Fig. 8. The partial revolution of i. the shell B on the head A, which takes place when itis released fromthe clutch-pins e, will cause the pinion Y to revolve on its axis until the pinion-arm takes the position shown by dotted linesat Y', Fig: 8, in 'which position it will evidently come in contact with the clos- 1 `ing-pin a during the revolution of the diehead, which will result in turning the pinion on its axis'until the end of the pinion-arm Jagain passes inside of the closing-pin n, when the head A will engagethe clutch-pins e and the die-head be once more in position for work;

As the closing-arm o, Fig. 4, is fastened to tlie'stopbar J the pin awill occupythe position relative to the die-head (shown in Fig. 8)

" cam-stop K.

only when the carriage I is back against the Vhen the carriage I is inany Ithe shell B, the pinion Y, and the segment Z,

.positionit will close the die-head, as already i shown. y 4o Havingthus described the various principles and functions of my bolt-threading machine. what I claim, and desire to secure by Letters Patent, is-

1. The combination of the spindle-head A,

for the purpose speciiied and shown.

2. The combination of the cam-stop K, the stop-bar J, the closing-arm o, the pinion Y, the segment Z, the head A, and the shell lB, subA stantially as and for the purpose specified.

' 3. The combination of the carriage I, the cam-stop K, the stop-bar J, and the gage-arm N, substantially as and forthe purpose shown and described. y

4. The hollow screw m, having two sides of the thread iiattened sufcie'ntly to allow it to enter directly into the slot in Chaser-holder C, combined `with the adjustingscrew p and p chaser-holder C, substantially as and for the 6o purpose speciiied.

WILLIAM L. BERGEN.

W'itnesses:

0. D. WALWORTH, HORACE N. J oNns. 

